(3a-5b)²-(3a+5b)²=?

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(3a-5b)²-(3a+5b)²=?
(3a-5b)²-(3a+5b)²=?

(3a-5b)²-(3a+5b)²=?
(3a-5b)²-(3a+5b)²
=[(3a-5b)+(3a+5b)][(3a-5b)-(3a+5b)]
=6a*(-10b)
=-60ab